Xiaomi and Redmi’s modern smartphones have powerful multimedia capabilities that are often hidden in the depths of system settings, one of which is the ability to stream audio to two Bluetooth devices simultaneously, a highly useful option for sharing movies while traveling or listening to music in a company when one set of acoustics is not enough.
However, the standard MIUI or HyperOS shell interface doesn’t always offer an obvious button to activate this mode. Users often face a situation where the second pair of headphones simply does not connect or the sound is switched to a new device, interrupting playback on the first. In this article, we will discuss the technical nuances of the Bluetooth adapter in Xiaomi smartphones and how to circumvent software restrictions.
It’s worth noting that the success of the operation depends not only on the phone model, but also on the version of the Android operating system. Older versions may require the use of third-party applications or activation of the engineering menu, while new flagships support the Dual Audio feature natively. We will look at all the available methods, from simple settings to advanced manipulations.
Technical limitations and protocol support
Before you start setting up, you need to understand the physical limitations of wireless communication. Bluetooth was originally designed to connect one to one, so transmitting sound to two receivers requires support for special profiles or software emulation. Xiaomi smartphones, based on Qualcomm and MediaTek chips, have different architecture for processing audio streams.
The Bluetooth version is key. The two pairs of headphones require Bluetooth 5.0 and higher to work smoothly. Older units may have difficulty synchronizing audio, leading to audio desynchronization or severe latency. Codec bandwidth is also important: high-quality audio can overload the channel.
In some cases, the restriction is not on the hardware side, but on the software level, and the manufacturer can block this feature to separate market segments or due to licensing restrictions, which is why even the powerful Xiaomi Redmi Note may not have a dual audio button in the standard menu, although the chipset technically allows it.
The influence of codecs on sound quality
It's important to consider power consumption. Simultaneously transferring data to two devices increases the load on the Bluetooth controller and drains the battery faster. If you're planning a long movie, make sure the battery is strong enough, or connect the phone to an external power source.
Native capabilities of MIUI and HyperOS
In recent Xiaomi shells, the company has begun to introduce native support for multiple connectivity, the simplest and most stable way to do so without additional software, but this feature is often hidden or only available in certain regions of the firmware (e.g., Global or EU versions, but is not available in China ROM without modifications).
To check for the feature, go to the Settings → Bluetooth menu. Connect the first pair of headphones and start playing the sound. Then turn on the search mode on the second headset. If your phone supports Dual Audio, the option to select the second device may appear in the list of available devices or in the drop-down play menu.
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Sometimes the function only activates after connecting both devices separately. First connect one headphone, play the track, then connect the second one and try to switch the output through the notification curtain.
Some Xiaomi models with HyperOS have an Audio Mixer feature or similar media titles, which allows you to adjust the volume for each connected device independently, which is especially convenient if one listener hears worse than the other and requires an increase in volume.
If the standard menu doesn't have a switch, it doesn't mean that the feature isn't available. Often it's just hidden from the average user, so you'll need to use hidden engineering settings or third-party utilities, which we'll discuss in the next sections. Don't rush to reset your phone when you try to find this option.
Use of engineering menu and debugging
The most effective method for devices where the function is hidden software is activation through the developer menu, which allows you to force support for multiple connections at the level of Bluetooth drivers. Be careful: changing the parameters in the engineering menu requires caution, since incorrect settings can affect the stability of wireless modules.
To start, activate the developer mode. Go to Settings → About Phone and quickly click on MIUI or HyperOS seven times. Once the “You’ve become a developer” notification appears, go back to the main settings menu and find the “Additional” → “Developers” section.
☑️ Activation of hidden functions
Inside the developer menu, scroll down to the Bluetooth-related block. We are interested in "Enable Multiple Bluetooth Devices" or "Bluetooth Audio Codec" (depending on the Android version).
⚠️ Note: Changes to codec settings (e.g., selections) LDAC or aptX) when you connect two devices, it can result in no sound at all. If the sound is gone after the changes, return the codec settings to "Automatically" or SBC.
After making the changes, make sure to reboot the smartphone completely, so that the Bluetooth stack is initialized with the new settings. Only after the reboot, try pairing two pairs of headphones at the same time.
Third-party applications for Dual Audio
If the system methods fail, specialized applications from Google Play come to the rescue, using the Android API to redirect the audio stream, and one popular solution is the Sound Assistant app (often used on Samsung, but there are analogues for Xiaomi) or utilities like AudioShare.
The way these programs work is to create a virtual audio device, and the phone sends sound to the app, and it then streams it to the connected Bluetooth headsets, which can create minimal latency, but it's often invisible to watching videos on YouTube or in a local player.
When installing third-party software, be sure to provide all the requested permissions, especially access to the microphone and media management. Without these permissions, the application will not be able to intercept the audio stream. It is also recommended to add the application to the battery exclusion list so that the system does not “kill” the sound transmission process in the background.
| Annex | Type of work | Sound delay | Demands a Root. |
|---|---|---|---|
| Sound Assistant | System mixer | Low. | No. |
| AudioShare | Relay | Medium | No. |
| Lesser AudioSwitch | Switching exits | Minimum | No. |
| Bluetooth Audio Widget | Codec management | Low. | Partially. |
It is worth remembering that the use of third-party mixers can conflict with system volume settings. In some cases, the volume controller on the side of the phone will control only the main channel, and the volume of the second device will have to be adjusted through the interface of the application itself.
Synchronization problems and delays
The most common problem when connecting two pairs of headphones is desynchronization, and the sound in the left and right ears (or in different headphones) can go at different speeds, creating an echo effect, due to differences in data buffering on different devices and different signal processing speeds.
To minimize delays, try using the same brand headphones and preferably the same model. Different Bluetooth chips can process data packets at different speeds. If you have different models, try changing the size of the Bluetooth buffer in the developer settings, but this requires experimental value-setting.
Also, delay is affected by distance: keep your phone as close to both devices as possible. If one user moves to the other room, the signal will weaken and buffering will increase, leading to a stuttering sound. Ideally, both listeners should be within a radius of 3-5 meters from the smartphone.
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Perfect synchronization is possible only with the same headphones and no physical obstacles between the phone and receivers.
If you're watching a video, use players with the audio delay function. Many modern video players allow you to manually shift the audio track relative to the video, which helps offset the out-of-synchrony caused by a Bluetooth connection.
Solving Typical Connection Errors
Often, users are faced with a situation where the second device simply does not want to connect, giving an error "failed to connect." First of all, check if the connection is busy. Some old headsets do not know how to work in "slave" mode with active multimedia flow.
Try forgetting both devices in Bluetooth settings, restarting your phone, and pairing them again, connecting them in turn. Network resets sometimes help: go to Settings → Connection and Sharing → Reset Wi-Fi, mobile network, and Bluetooth. This will clear the cache of connection errors.
⚠️ Note: Resetting your network settings will delete all stored Wi-Fi passwords and associated devices. Make sure you remember passwords from important networks before performing this operation.
If the problem persists, check system updates. Xiaomi regularly releases security patches and improvements for communication modules.The lack of the latest MIUI update can be the reason drivers conflict with newer versions of Android.
In the extreme case, if neither method works, it is possible that the hardware of your smartphone does not support simultaneous transmission of two A2DP streams, which is typical for budget models of the past, in which case the only way out is to use a Bluetooth splitter or a wired splitter.